diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2026-06-16 17:33:20 +0530 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2026-06-16 17:33:20 +0530 |
| commit | 18ecdd4d0aabc428318bbc2ca6134483a90ea697 (patch) | |
| tree | c1f5157dc1680f0eb54d9c9e6672e617589a8aba /Documentation | |
| parent | 4f7e89065e41fd487e411d35b5caeac2a10af10e (diff) | |
| parent | 69efd863a78584b9416ed6be0e1e7349124b4a00 (diff) | |
| download | lwn-18ecdd4d0aabc428318bbc2ca6134483a90ea697.tar.gz lwn-18ecdd4d0aabc428318bbc2ca6134483a90ea697.zip | |
Merge tag 'probes-v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull probes updates from Masami Hiramatsu:
- BTF support for dereferencing pointers
Add syntax to the parsing of eprobes to typecast structure pointer
trace event fields, enabling BTF-based dereferencing instead of
relying on manual offsets.
- Improvements and robustness enhancements
- Use flexible array for entry fetch code.
Store probe entry fetch instructions in the probe_entry_arg
allocation via a flexible array member to simplify memory
allocation and lifetime management.
- Replace BUG_ON with lockdep_assert_held in uprobe_buffer functions
Replace BUG_ON() calls with lockdep_assert_held() in uprobe buffer
enable/disable paths to prevent kernel crashes and better verify
lock ownership.
- Ensure the uprobe buffer size is bigger than event size.
Add a BUILD_BUG_ON() assertion to guarantee that the per-CPU
uprobe working buffer size is always larger than the maximum probe
event size.
* tag 'probes-v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
tracing/eprobes: Allow use of BTF names to dereference pointers
tracing: Replace BUG_ON with lockdep_assert_held in uprobe_buffer functions
tracing: Use flexible array for entry fetch code
tracing/probes: Ensure the uprobe buffer size is bigger than event size
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/trace/eprobetrace.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/trace/eprobetrace.rst b/Documentation/trace/eprobetrace.rst index 89b5157cfab8..fe3602540569 100644 --- a/Documentation/trace/eprobetrace.rst +++ b/Documentation/trace/eprobetrace.rst @@ -46,6 +46,10 @@ Synopsis of eprobe_events (x8/x16/x32/x64), VFS layer common type(%pd/%pD), "char", "string", "ustring", "symbol", "symstr" and "bitfield" are supported. + (STRUCT)FIELD->MEMBER[->MEMBER] : If BTF is supported, typecast FIELD to + a pointer to STRUCT and then derference the pointer defined by + ->MEMBER. Note that when this is used, the FIELD name does not + need to be prefixed with a '$'. Types ----- |